Combo box as an argument of an UDF

[Guido Meng]

Hello

I've just recently learned how to use User Defined Functions (UDFS) but I've been unable to make one or more of the arguments of the UDFS to have a drop list with a limited number of options, for example TRUE or FALSE, any given day of the week, etc. Can someone please tell me if there is a way for doing this, using VBA or maybe inserting some sort of ActiveX control (Combo or List Box) into a UDF argument so that the end user of the function has a limited number of options to choose.

Thanks...